Tire changing stand



Sept. 3, 1940. H, sElP 2,213,535

TIRE CHANGING STAND Filed Sept. 26, 1938 2 Sheets-Sheet 1 INV Sept. 3, 1940. H. F. sElP 2,213,535

TIRE CHANGING STAND Filed sept. 26. i938 2. Sheets-Sheet 2 Mum" 55 m LLL 75 f 5'? v N N Z/ 1 f/Lygi mfw Y ATTORNEYS Patented Sept. 3,' 1940 .UNITED STATES PATENT OFFICE 2,213,535 TIRE CHANGING STAND Herbert F. Seip, Waltham, Mass. Application september'zs, 193s, serial No. 231,810

1c1aim.- (c1. 1441-288) y This invention relates to tire changing stands and has for an object to provide a simplified form of pneumatic jack having novel means for sup, porting a wheel in various angular positions from the vertical to the horizontal While work is beingA done upon the tire, the device being particularly well adapted for use in connection with large heavy truck wheels which ordinarily cannot be expeditiously handledby similar de- 1n vices now in use.

A further object is to provide adevlce of this character which will be formed of a few strong simple and durable parts, which will be inexpensive to manufacture, and which will not easily get out of order.

With the above and other objects in View the invention consists of certain novel details oi construction and combinations of parts hereinafter fully described and claimed, it being understood 2n that various modications may be resorted to within the scope of the appended claim without departing from the spirit or sacriicing any of the advantages of the invention. y

In the. accompanying drawings forming part of 25 this specication,

Figure 1 is a longitudinal sectional view of a tire changing stand constructed in accordance with the invention.v

Figure 2 is a cross sectional view of the stand 80 taken on the line 2-2 of Figure 1 and showing the lower casing and pneumatic controls in top plan.

Figure 3 is a detail side elevation of the parts for supporting the Wheel in various adjusted 35 positions.

Figure 4 is a, detail sectional view of a modied form of clamp for engaging the wheel.

Referring now to the drawings in which like characters of reference designate similar parts in 40 the various views, I0 designates a substantially cylindrical casing having a. flange Il at' the top and adapted to be sunk into the ground or other support I2. Drain openings I3 are formed in the bottom I4 of the casing.

4,5 A pneumatic cylinder I5 extends downwardly from the center of the bottom of the casing and is equipped at the top with a flange I6 adapted to engage the marginal portions of an opening I1 formed centrally in the bottom I4 of the cas- 50 ing. A clamp ring I8 is bolted as shown at I9- to the ange I6 and is provided with an upstanding guide ange which slidably receives a pneumatic piston 2 I.

The pneumatic; piston forms a standard for l Il supporting a vehicle wheel and is provided with a head 22 having rings 23 to seal the piston pressure tight against the wall of the cylinder I5. Compressed air is let into the cylinder against the bottom face of the piston through a port 24 formed in the bottom of the cylinder I5 and 5 connected through the medium of a pipe 25 to a compressed air supply pipe 26. The'pipe 25 extends upwardly along the cylinder I5 and along the exterior of the casing I0 so as not to interfere with the working parts of thedevice air supply pipe' is equipped on opposite sides of the intake end of the pipe 25 with an air inlet valve. 21 and an air outlet valve 28 -having respective spring pressed stems 29 and 30 normally kholding the valves closed and adapted to be 16 depressed selectively by the loperators foot to let compressed air into .the cylinder l5 0r tovent air from the cylinder I5 to respectively raise or lower the piston 2l. An outlet pipe 3l is connected to the outlet valve 28 and opens through 20 the wall of. the casing I0 intothe casing.

A brake shoe 32r is equipped with a'brake band 33 adaptedto frictionally engage the' piston 2| and hold the piston stationary against rotation on its axis. Thefbrake shoe is equipped with a 25 link 34 the outer end `of which is connected to a bell crank lever 35 which is pivotally mounted on a bracket 36 which is secured to the inner face of the vertical Wall of the casing I0. 'A push rod 31 is connected at the lower end to the bell 30 crank lever and is formed on one side with teeth 38` adapted to engage with a stop plate 39 which is secured to the flange II of the casing. The stop plate is provided with a slot 40 of suflicient length to permit the push rod being rocked out- 35 Wardly to disengage the teeth from the stop plate. p

A helical spring 4I is sleeved on the push rod and bears at the upper end against a collar 42 secured to the push rod, and at the lower end against a bracket 43 which is secured to the 40 vertical Wall of the casing I0 and is provided with an opening 44 which slidably receives the push rod.

For mounting the brake shoe a pin 45, best shown in Figure 2, is secured to the clamp ring 45 I8 and one end of the shoe is pivotally mounted upon the pin. The opposite end of the shoe is pivotally secured to a lever'46 which is pivoted intermediate the ends upon a pivot pin 41 which rises from the clamp ring diametrically opposite w the pivot pin 45. The free end of the link is connected to the above mentioned push rod.

To release the brake shoe the operator depresses push rod against the tension of the spring 4I until one of the teeth 38 hooks over the stop u The 10 plate 39, whereupon air may be admitted to the cylinder to elevate the piston 2|. The operator may now depress the push rod and move it to the outerend of the slot 40 then release it to permit the spring 4I to expand and rock the bell crank lever 45 and apply the brake to prevent rotation of the piston. However, the push rod may be depressed at any time during the work upon the tire to release the brake and permit the piston to be rotated axially.

Referring nowto Figures 1 and 3 it will be Y seen that the piston 2| terminates at the upper end in a disc head 48 upon which is bolted a bracket 49 having upstanding spaced hinge ears 50. An arm 5| is received at the lower end between the hinge ears and a pivot shaft 52 -is keyed to the arm and rotatably mounted on the hinge ears. One end of the shaft projects beyond one of the hinge ears and is equipped with a segment gear 53 which engages a worm pinion 54 which is mounted at the ends in bearings 55 which are bolted to the last named hinge ear as shown at 56. The end of the worm pinion is provided with a crank handle 51 through the medium of which the worm pinion may be turned to turn the segment gear and move the arm 5| through an arc of 90 degrees to any adjusted position `from the horizontal to the vertical in order to dispose a heavy truck `Wheel or the like for convenience in working upon the tire or applying or removing the wheel.

'I'he upper end of the arm 5| is uniformly reduced to provide a stem 58' which is exteriorly threaded to receive a nut 59. A washer 60 is disposed on the shoulder 6| at the base of the reduced stem 58 and a bottom clamp plate 62 is supported upon the washer 60. The clamp plate is provided with a centralopening 63 to receive the stem and is provided with a recess 64 at the peripheral edge to receive the face plate 65 of the rim 65 of a tire 61. Atop clamp plate 68 is provided with a centrally disposed guide tube 69 to slidably fit the stem 58 and is provided with a downwardly extending flange 10 adapted to engage the top face of the face plate 65 and clamp the rim and tire to the arm 5I when the clamp nut 59 is tightened.

In Figure 4 there is shown a modied form of Wheel clamping means. The reduced stem 'I8 of the wheel supporting arm 'l2 has mounted therein an annular wedge 13 which may be tightened against the face plate '|4 of a tire rim 15 to clamp the same against the flange 'i8 of a lower clamp plate 11. The clamp plate is supported upon a disc 18 which extends outwardly beyond the clamp plate and engages the inclined portion l5 of the rim and supports part of the weight of the wheel. The disc is supported upon a washer which engages the shoulder 8| at the base of the reduced end 10. A clamp nut 82 is threaded upon the upper end of the stem and when tightened wedges the annular wedge 13 tightly against the face plate 14 to hold the wheel in place whiler `present any desired portion of the tire to the operator during the course of the work upon the tire.

Since the operation of the device has been described as a description of the parts progressed it is thought that the invention will be fully understood without further explanation.

What is claimed is:

A tire changing stand comprising a standard terminating at theupper end in a disk head, a bracket secured to the head having upstanding spaced hinge ears, an armreceived at the lower end between the hinge ears, a pivot shaft passing through the arm and hinge ears and iixed to the arm, one end of the shaft projecting beyond one of the hinge ears, a segment gear xed to the projecting end of the shaft, tubular bearings secured Yto the last-named hinge ear and extending in alignment on said disk head, a worm pinion rotatably mounted in the bearings and having a portion exposed between the bearings meshing with the segment gear, a crank handle on one end of the worm pinion through the medium of which the worm pinion may be turned to turn the segment gear and move the arm through an arc of ninety degrees to any adjusted position from the horizontal to the vertical, and means for clamping the face plate of a heavy duty truck wheel, or the like, to the upper end of the arm.

HERBERT F. SEIP. 

